Finding the Fourth Proportional to 72,911.04, 109,318.56 and 28,542.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72,911.04 : 109,318.56 = 28,542.72 : x
2. Step 2: Convert to fraction form
   72,911.04/109,318.56 = 28,542.72/x
3. Step 3: Cross multiply
   72,911.04x = 109,318.56 × 28,542.72
4. Step 4: Simplify right side
   72,911.04x = 3,120,249,048.88
5. Step 5: Solve for x
   x = 3,120,249,048.88/72,911.04
6. Step 6: Final answer
   x = 42,795.29